First flight of the MX400 - RC Groups
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Sep 26, 2008, 06:23 PM
BeeZaur 480
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First flight of the MX400

I think it was a bit under powered, it just fell outta the sky. Tried to fly it with a 400DF and a 1350 TP 3S lipo.

FIrst flight of the MX400

It sure looked good there for a minute.
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Sep 26, 2008, 07:48 PM
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I didn't have very good luck when using my 400DH in my MX-400, it's a nice light weight motor but isn't happy unless it's running in that 90% range. I really like the 450TH paired with a 10-12T paired with a 1500-2100mah is the way to go. Of all the motors I have tried for this heli it's the best all around motor in terms of being easy on my Lipo's and having plenty of punch.
Oct 02, 2008, 12:08 AM
Roll on Two !
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It should have had plenty of power. I have a 400DF and run 12t (summer) or 13t winter. It never dropped like that. I can get well over 2600 rpm at less than 100% throttle. I do run 85 to 90% throttle when not in gov mode, and 85% in gov mode.
But it does run sort of hot at about 130*F on return on a summer day. I changed to a Scorpion HK2208-28 which does not seem to have as much instantaneous torque as the 400DF, but runs barely above air temp and uses 22% less current.
What ESC did you use with the 400DF ? I had to use a CC35 because other esc's could not soft start it.
The 400DF was easier on the batteries, returning with the batteries cooler than some other motors I have even though the 400DF motor can ran hot. Now I use the 400DF for a backup motor. I got it 2 1/2 years ago, and replaced it and a 430L 3550 with Scorpion motors which "beat" them off the heli !

Nov 08, 2008, 11:54 PM
BeeZaur 480
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I tried a couple different speedos and it didnt seem to help. I went to a 450 type and geared it down with a 10T and it pulls hardly any amps and flys alot better.

It fell out of the sky because the oneway was bad.

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